Japan's Kei Nishikori has tested positive for COVID-19 while in Florida - just two weeks ahead of the US Open.
The 30-year-old former world number four has been staying at the IMG Academy in Bradenton, Florida.
The tennis star has pulled out of the upcoming Western & Southern Open, a warm-up tournament for many before the Grand Slam.
Taking to his app, he said he is "feeling well and has very little symptoms, but will obviously be in complete isolation for the safety of everyone".
Nishikori added that he will get tested again on Friday, before a decision on US Open status is taken.


Troubled Marseille lose fifth straight as PSG win
Anders Dreyer’s brace earns San Diego road draw with Inter Miami
Man City beat Sunderland in thriller to maintain 100% start
Spaun uses Presidents Cup snub to win BMW PGA Championship
Atletico ride derby storm to beat 10-man Real Madrid 2-1
